406 lines
13 KiB
C
406 lines
13 KiB
C
/*=========================================================================*\
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* Unix domain socket dgram submodule
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* LuaSocket toolkit
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\*=========================================================================*/
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#include "luasocket.h"
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#include "auxiliar.h"
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#include "socket.h"
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#include "options.h"
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#include "unix.h"
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#include <string.h>
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#include <stdlib.h>
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#include <sys/un.h>
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#define UNIXDGRAM_DATAGRAMSIZE 8192
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// provide a SUN_LEN macro if sys/un.h doesn't (e.g. Android)
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#ifndef SUN_LEN
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#define SUN_LEN(ptr) \
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((size_t) (((struct sockaddr_un *) 0)->sun_path) \
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+ strlen ((ptr)->sun_path))
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#endif
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/*=========================================================================*\
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* Internal function prototypes
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\*=========================================================================*/
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static int global_create(lua_State *L);
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static int meth_connect(lua_State *L);
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static int meth_bind(lua_State *L);
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static int meth_send(lua_State *L);
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static int meth_receive(lua_State *L);
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static int meth_close(lua_State *L);
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static int meth_setoption(lua_State *L);
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static int meth_settimeout(lua_State *L);
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static int meth_gettimeout(lua_State *L);
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static int meth_getfd(lua_State *L);
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static int meth_setfd(lua_State *L);
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static int meth_dirty(lua_State *L);
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static int meth_receivefrom(lua_State *L);
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static int meth_sendto(lua_State *L);
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static int meth_getsockname(lua_State *L);
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static const char *unixdgram_tryconnect(p_unix un, const char *path);
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static const char *unixdgram_trybind(p_unix un, const char *path);
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/* unixdgram object methods */
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static luaL_Reg unixdgram_methods[] = {
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{"__gc", meth_close},
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{"__tostring", auxiliar_tostring},
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{"bind", meth_bind},
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{"close", meth_close},
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{"connect", meth_connect},
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{"dirty", meth_dirty},
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{"getfd", meth_getfd},
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{"send", meth_send},
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{"sendto", meth_sendto},
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{"receive", meth_receive},
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{"receivefrom", meth_receivefrom},
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{"setfd", meth_setfd},
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{"setoption", meth_setoption},
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{"setpeername", meth_connect},
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{"setsockname", meth_bind},
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{"getsockname", meth_getsockname},
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{"settimeout", meth_settimeout},
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{"gettimeout", meth_gettimeout},
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{NULL, NULL}
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};
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/* socket option handlers */
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static t_opt optset[] = {
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{"reuseaddr", opt_set_reuseaddr},
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{NULL, NULL}
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};
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/* functions in library namespace */
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static luaL_Reg func[] = {
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{"dgram", global_create},
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{NULL, NULL}
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};
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/*-------------------------------------------------------------------------*\
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* Initializes module
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\*-------------------------------------------------------------------------*/
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int unixdgram_open(lua_State *L)
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{
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/* create classes */
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auxiliar_newclass(L, "unixdgram{connected}", unixdgram_methods);
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auxiliar_newclass(L, "unixdgram{unconnected}", unixdgram_methods);
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/* create class groups */
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auxiliar_add2group(L, "unixdgram{connected}", "unixdgram{any}");
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auxiliar_add2group(L, "unixdgram{unconnected}", "unixdgram{any}");
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auxiliar_add2group(L, "unixdgram{connected}", "select{able}");
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auxiliar_add2group(L, "unixdgram{unconnected}", "select{able}");
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luaL_setfuncs(L, func, 0);
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return 0;
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}
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/*=========================================================================*\
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* Lua methods
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\*=========================================================================*/
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static const char *unixdgram_strerror(int err)
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{
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/* a 'closed' error on an unconnected means the target address was not
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* accepted by the transport layer */
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if (err == IO_CLOSED) return "refused";
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else return socket_strerror(err);
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}
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static int meth_send(lua_State *L)
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{
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p_unix un = (p_unix) auxiliar_checkclass(L, "unixdgram{connected}", 1);
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p_timeout tm = &un->tm;
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size_t count, sent = 0;
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int err;
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const char *data = luaL_checklstring(L, 2, &count);
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timeout_markstart(tm);
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err = socket_send(&un->sock, data, count, &sent, tm);
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if (err != IO_DONE) {
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lua_pushnil(L);
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lua_pushstring(L, unixdgram_strerror(err));
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return 2;
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}
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lua_pushnumber(L, (lua_Number) sent);
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return 1;
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}
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/*-------------------------------------------------------------------------*\
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* Send data through unconnected unixdgram socket
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\*-------------------------------------------------------------------------*/
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static int meth_sendto(lua_State *L)
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{
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p_unix un = (p_unix) auxiliar_checkclass(L, "unixdgram{unconnected}", 1);
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size_t count, sent = 0;
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const char *data = luaL_checklstring(L, 2, &count);
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const char *path = luaL_checkstring(L, 3);
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p_timeout tm = &un->tm;
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int err;
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struct sockaddr_un remote;
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size_t len = strlen(path);
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if (len >= sizeof(remote.sun_path)) {
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lua_pushnil(L);
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lua_pushstring(L, "path too long");
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return 2;
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}
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memset(&remote, 0, sizeof(remote));
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strcpy(remote.sun_path, path);
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remote.sun_family = AF_UNIX;
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timeout_markstart(tm);
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#ifdef UNIX_HAS_SUN_LEN
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remote.sun_len = sizeof(remote.sun_family) + sizeof(remote.sun_len)
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+ len + 1;
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err = socket_sendto(&un->sock, data, count, &sent, (SA *) &remote, remote.sun_len, tm);
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#else
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err = socket_sendto(&un->sock, data, count, &sent, (SA *) &remote,
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sizeof(remote.sun_family) + len, tm);
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#endif
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if (err != IO_DONE) {
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lua_pushnil(L);
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lua_pushstring(L, unixdgram_strerror(err));
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return 2;
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}
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lua_pushnumber(L, (lua_Number) sent);
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return 1;
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}
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static int meth_receive(lua_State *L) {
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p_unix un = (p_unix) auxiliar_checkgroup(L, "unixdgram{any}", 1);
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char buf[UNIXDGRAM_DATAGRAMSIZE];
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size_t got, wanted = (size_t) luaL_optnumber(L, 2, sizeof(buf));
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char *dgram = wanted > sizeof(buf)? (char *) malloc(wanted): buf;
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int err;
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p_timeout tm = &un->tm;
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timeout_markstart(tm);
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if (!dgram) {
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lua_pushnil(L);
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lua_pushliteral(L, "out of memory");
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return 2;
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}
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err = socket_recv(&un->sock, dgram, wanted, &got, tm);
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/* Unlike STREAM, recv() of zero is not closed, but a zero-length packet. */
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if (err != IO_DONE && err != IO_CLOSED) {
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lua_pushnil(L);
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lua_pushstring(L, unixdgram_strerror(err));
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if (wanted > sizeof(buf)) free(dgram);
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return 2;
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}
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lua_pushlstring(L, dgram, got);
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if (wanted > sizeof(buf)) free(dgram);
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return 1;
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}
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/*-------------------------------------------------------------------------*\
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* Receives data and sender from a DGRAM socket
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\*-------------------------------------------------------------------------*/
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static int meth_receivefrom(lua_State *L) {
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p_unix un = (p_unix) auxiliar_checkclass(L, "unixdgram{unconnected}", 1);
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char buf[UNIXDGRAM_DATAGRAMSIZE];
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size_t got, wanted = (size_t) luaL_optnumber(L, 2, sizeof(buf));
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char *dgram = wanted > sizeof(buf)? (char *) malloc(wanted): buf;
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struct sockaddr_un addr;
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socklen_t addr_len = sizeof(addr);
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int err;
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p_timeout tm = &un->tm;
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timeout_markstart(tm);
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if (!dgram) {
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lua_pushnil(L);
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lua_pushliteral(L, "out of memory");
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return 2;
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}
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addr.sun_path[0] = '\0';
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err = socket_recvfrom(&un->sock, dgram, wanted, &got, (SA *) &addr,
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&addr_len, tm);
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/* Unlike STREAM, recv() of zero is not closed, but a zero-length packet. */
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if (err != IO_DONE && err != IO_CLOSED) {
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lua_pushnil(L);
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lua_pushstring(L, unixdgram_strerror(err));
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if (wanted > sizeof(buf)) free(dgram);
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return 2;
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}
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lua_pushlstring(L, dgram, got);
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/* the path may be empty, when client send without bind */
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lua_pushstring(L, addr.sun_path);
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if (wanted > sizeof(buf)) free(dgram);
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return 2;
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}
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/*-------------------------------------------------------------------------*\
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* Just call option handler
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\*-------------------------------------------------------------------------*/
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static int meth_setoption(lua_State *L) {
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p_unix un = (p_unix) auxiliar_checkgroup(L, "unixdgram{any}", 1);
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return opt_meth_setoption(L, optset, &un->sock);
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}
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/*-------------------------------------------------------------------------*\
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* Select support methods
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\*-------------------------------------------------------------------------*/
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static int meth_getfd(lua_State *L) {
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p_unix un = (p_unix) auxiliar_checkgroup(L, "unixdgram{any}", 1);
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lua_pushnumber(L, (int) un->sock);
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return 1;
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}
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/* this is very dangerous, but can be handy for those that are brave enough */
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static int meth_setfd(lua_State *L) {
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p_unix un = (p_unix) auxiliar_checkgroup(L, "unixdgram{any}", 1);
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un->sock = (t_socket) luaL_checknumber(L, 2);
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return 0;
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}
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static int meth_dirty(lua_State *L) {
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p_unix un = (p_unix) auxiliar_checkgroup(L, "unixdgram{any}", 1);
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(void) un;
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lua_pushboolean(L, 0);
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return 1;
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}
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/*-------------------------------------------------------------------------*\
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* Binds an object to an address
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\*-------------------------------------------------------------------------*/
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static const char *unixdgram_trybind(p_unix un, const char *path) {
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struct sockaddr_un local;
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size_t len = strlen(path);
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if (len >= sizeof(local.sun_path)) return "path too long";
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memset(&local, 0, sizeof(local));
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strcpy(local.sun_path, path);
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local.sun_family = AF_UNIX;
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size_t addrlen = SUN_LEN(&local);
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#ifdef UNIX_HAS_SUN_LEN
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local.sun_len = addrlen + 1;
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#endif
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int err = socket_bind(&un->sock, (SA *) &local, addrlen);
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if (err != IO_DONE) socket_destroy(&un->sock);
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return socket_strerror(err);
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}
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static int meth_bind(lua_State *L)
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{
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p_unix un = (p_unix) auxiliar_checkclass(L, "unixdgram{unconnected}", 1);
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const char *path = luaL_checkstring(L, 2);
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const char *err = unixdgram_trybind(un, path);
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if (err) {
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lua_pushnil(L);
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lua_pushstring(L, err);
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return 2;
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}
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lua_pushnumber(L, 1);
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return 1;
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}
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static int meth_getsockname(lua_State *L)
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{
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p_unix un = (p_unix) auxiliar_checkgroup(L, "unixdgram{any}", 1);
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struct sockaddr_un peer = {0};
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socklen_t peer_len = sizeof(peer);
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if (getsockname(un->sock, (SA *) &peer, &peer_len) < 0) {
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lua_pushnil(L);
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lua_pushstring(L, socket_strerror(errno));
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return 2;
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}
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lua_pushstring(L, peer.sun_path);
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return 1;
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}
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/*-------------------------------------------------------------------------*\
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* Turns a master unixdgram object into a client object.
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\*-------------------------------------------------------------------------*/
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static const char *unixdgram_tryconnect(p_unix un, const char *path)
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{
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struct sockaddr_un remote;
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size_t len = strlen(path);
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if (len >= sizeof(remote.sun_path)) return "path too long";
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memset(&remote, 0, sizeof(remote));
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strcpy(remote.sun_path, path);
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remote.sun_family = AF_UNIX;
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timeout_markstart(&un->tm);
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size_t addrlen = SUN_LEN(&remote);
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#ifdef UNIX_HAS_SUN_LEN
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remote.sun_len = addrlen + 1;
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#endif
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int err = socket_connect(&un->sock, (SA *) &remote, addrlen, &un->tm);
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if (err != IO_DONE) socket_destroy(&un->sock);
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return socket_strerror(err);
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}
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static int meth_connect(lua_State *L)
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{
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p_unix un = (p_unix) auxiliar_checkgroup(L, "unixdgram{any}", 1);
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const char *path = luaL_checkstring(L, 2);
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const char *err = unixdgram_tryconnect(un, path);
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if (err) {
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lua_pushnil(L);
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lua_pushstring(L, err);
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return 2;
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}
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/* turn unconnected object into a connected object */
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auxiliar_setclass(L, "unixdgram{connected}", 1);
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lua_pushnumber(L, 1);
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return 1;
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}
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/*-------------------------------------------------------------------------*\
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* Closes socket used by object
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\*-------------------------------------------------------------------------*/
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static int meth_close(lua_State *L)
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{
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p_unix un = (p_unix) auxiliar_checkgroup(L, "unixdgram{any}", 1);
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socket_destroy(&un->sock);
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lua_pushnumber(L, 1);
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return 1;
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}
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/*-------------------------------------------------------------------------*\
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* Just call tm methods
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\*-------------------------------------------------------------------------*/
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static int meth_settimeout(lua_State *L)
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{
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p_unix un = (p_unix) auxiliar_checkgroup(L, "unixdgram{any}", 1);
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return timeout_meth_settimeout(L, &un->tm);
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}
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static int meth_gettimeout(lua_State *L)
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{
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p_unix un = (p_unix) auxiliar_checkgroup(L, "unixdgram{any}", 1);
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return timeout_meth_gettimeout(L, &un->tm);
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}
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/*=========================================================================*\
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* Library functions
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\*=========================================================================*/
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/*-------------------------------------------------------------------------*\
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* Creates a master unixdgram object
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\*-------------------------------------------------------------------------*/
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static int global_create(lua_State *L)
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{
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t_socket sock;
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int err = socket_create(&sock, AF_UNIX, SOCK_DGRAM, 0);
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/* try to allocate a system socket */
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if (err == IO_DONE) {
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/* allocate unixdgram object */
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p_unix un = (p_unix) lua_newuserdata(L, sizeof(t_unix));
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/* set its type as master object */
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auxiliar_setclass(L, "unixdgram{unconnected}", -1);
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/* initialize remaining structure fields */
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socket_setnonblocking(&sock);
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un->sock = sock;
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io_init(&un->io, (p_send) socket_send, (p_recv) socket_recv,
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(p_error) socket_ioerror, &un->sock);
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timeout_init(&un->tm, -1, -1);
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buffer_init(&un->buf, &un->io, &un->tm);
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return 1;
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} else {
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lua_pushnil(L);
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lua_pushstring(L, socket_strerror(err));
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return 2;
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}
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}
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